[gimp] INSTALL: add appstream-glib in the dependency list.

[Jehan <jehanp src gnome org>]

commit 17e37ddf243bdd8e8b0d014533b5e8f33d000bbc
Author: Jehan <jehan girinstud io>
Date:   Sun Aug 19 18:11:56 2018 +0200

    INSTALL: add appstream-glib in the dependency list.

 INSTALL.in   | 1 +
 configure.ac | 2 ++
 2 files changed, 3 insertions(+)
---
diff --git a/INSTALL.in b/INSTALL.in
index 39946c49de..36d8b88b7a 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -141,6 +141,7 @@ header files installed.
 
      Package Name         Version
 
+     appstream-glib       @APPSTREAM_GLIB_REQUIRED_VERSION@
      ATK                  @ATK_REQUIRED_VERSION@
      babl                 @BABL_REQUIRED_VERSION@
      cairo                @CAIRO_REQUIRED_VERSION@
diff --git a/configure.ac b/configure.ac
index cb7b71081a..d4b7f22e18 100644
--- a/configure.ac
+++ b/configure.ac
@@ -145,6 +145,7 @@ AC_DEFINE(GIMP_TOOL_VERSION, "gimp_tool_version",
           [GIMP tools version])
 
 # These are used in the .pc files
+APPSTREAM_GLIB_REQUIRED_VERSION=appstream_glib_required_version
 GLIB_REQUIRED_VERSION=glib_required_version
 GDK_PIXBUF_REQUIRED_VERSION=gdk_pixbuf_required_version
 GTK_REQUIRED_VERSION=gtk_required_version
@@ -177,6 +178,7 @@ PYTHON2_REQUIRED_VERSION=python2_required_version
 WEBP_REQUIRED_VERSION=webp_required_version
 LIBHEIF_REQUIRED_VERSION=libheif_required_version
 XGETTEXT_REQUIRED_VERSION=xgettext_required_version
+AC_SUBST(APPSTREAM_GLIB_REQUIRED_VERSION)
 AC_SUBST(GLIB_REQUIRED_VERSION)
 AC_SUBST(GDK_PIXBUF_REQUIRED_VERSION)
 AC_SUBST(GTK_REQUIRED_VERSION)